Need Help Removing Timing Chain Sprocket From Crankshaft
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Thread: Need Help Removing Timing Chain Sprocket From Crankshaft

  1. #1
    Senior Member elime's Avatar
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    Need Help Removing Timing Chain Sprocket From Crankshaft

    I have an XT225 crankshaft I picked up for a song but it needs a new connecting rod. I found a new connecting rod on Aliexpress and a place in Arizona that will do the work but they want the crankshaft completely stripped before proceeding. A quick trip to Harbor Freight for a gear puller, I installed the gear puller and tightened the removing / center bolt to the point I can't make it any tighter plus I fear damaging the sprocket, and the dang thing hasn't shown a hint of movement. I tried tapping on it with a hammer and applying heat with a propane torch and no luck.

    I am open to suggestions.



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    Long live the internal combustion engine!

  2. #2
    Senior Member buellzebub's Avatar
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    Quote Originally Posted by elime View Post
    I have an XT225 crankshaft I picked up for a song but it needs a new connecting rod. I found a new connecting rod on Aliexpress and a place in Arizona that will do the work but they want the crankshaft completely stripped before proceeding. A quick trip to Harbor Freight for a gear puller, I installed the gear puller and tightened the removing / center bolt to the point I can't make it any tighter plus I fear damaging the sprocket, and the dang thing hasn't shown a hint of movement. I tried tapping on it with a hammer and applying heat with a propane torch and no luck.

    I am open to suggestions.



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    Hi elime,
    With the puller fully tightened try giving the centre (sorry, center lol) bolt a few smart taps with a hammer. With luck the tension and the shock should move it
    Edit: Sorry, just re-read it and realised you've tried tapping it. Doh!
    Last edited by buellzebub; 11-13-2017 at 08:49 AM.

  3. #3
    Senior Member admiral's Avatar
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    Sgt. Schultz here. I know nothing...that can help.
    Hidden Content A ride in the woods helps me relax and release tension. The fact I'm dragging a body should be entirely irrelevant?

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  5. #4
    Super Moderator littletommy's Avatar
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    Bigger hammer, hit it harder, Penetrating oil and more heat?
    elime, Badgerflorida and maddawgj like this.
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  6. #5
    Senior Member elime's Avatar
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    Quote Originally Posted by littletommy View Post
    Bigger hammer, hit it harder, Penetrating oil and more heat?
    I will try penetrating oil. Remember, I don't want to wreck anything.
    Long live the internal combustion engine!

  7. #6
    Senior Member grewen's Avatar
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    machine shop?
    Greg

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  8. #7
    Senior Member Heli-Mech's Avatar
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    I used that exact style of puller to remove my timing gear ....... twice ........ since I got the orientation wrong on install the first time around. I didn't use the crank bolt, instead I used the flat snap head and a sacrificial piece of 3/16" thick aluminum between the crank nose and flat snap head. I wouldn't want to apply force to the crank bolt threads the way you have it currently set up.

    It takes a lot of force and will "SNAP" and "PING" as its being removed. It will work you'll just have to come on to it. I used my big impact gun and heated it with a MAP torch. Put the crank in a vice pinching on the the webs only ...... then set your self up heat the fuck out of it and give it hell.

    For install I put the crank in the freezer overnight and then heated the bering and gear up and they dropped right on into postion. I use a small old toaster oven and aluminum baking pan ... submerged the gear and bearing in ATF fluid and heated to 250-300 for 10-15min or so.

    Pay close attention to the "DOT" on the gear face, It aligns dead center with the keyway in the crank ..... and if you use my above tricks you have seconds to align it before it cools tight.
    Last edited by Heli-Mech; 11-13-2017 at 01:07 PM.

  9. #8
    Senior Member elime's Avatar
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    The bolt is bottomed out but still I wondered how wise it was to apply force to it. I will remove it and start over. Thanks for sharing your experience.
    Long live the internal combustion engine!

  10. #9
    Senior Member Heli-Mech's Avatar
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    No worries man. Good luck and play safe!
    littletommy and Badgerflorida like this.

  11. #10
    Senior Member Heli-Mech's Avatar
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    Quote Originally Posted by elime View Post
    The bolt is bottomed out but still I wondered how wise it was to apply force to it. I will remove it and start over. Thanks for sharing your experience.
    I also pulled it via the toothed gear not the upper lip that your puller is set up on .... which seemed sketchy at the time but worked fine.

    Also when you tighten the clamp halves for the puller just snug them up. If you over tighten them it applies additional clamping friction to the press fit piece.

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